Blue colloidal silver imaging system

ABSTRACT

BLUE COLLOIDAL SILVER HAVING AN AVERAGE DIAMETER RANGE FROM ABOUT 50 A. TO ABOUT 300 A. IS PREPARED BY PHYSICAL DEVELOPMENT OF SILVER NUCLEI HAVING AN AVERAGE DIAMETER OF ABOUT 10 A. TO ABOUT 200 A. COATED ON A SUPPORT. AN IMAGE MAY BE OBTAINED IN THE BLUE SILVER BY CONTACTING IT WITH HALIDE IONS WHICH CAUSES THE BLUE SILVER TO RECRYSTALLIZE TO A YELLOW FORM. CONTACTING A SLIGHTLY MOISTENED FINGER AGAINST BLUE SILVER WITH LIGHT PRESSURE RESULTS IN A FINGERPRINT OF EXCELLENT QUALITY IN THE FORM OF YELLOW SILVER. HALIDE IONS MAY BE TRANSFERRED FROM AN EXPOSED AND DEVELOPED SILVER HALIDE LAYER WITH RECRYSTALLIZATION OF THE BLUE SILVER OCCURRING IN THE AREA THAT CORRESPONDS TO THE EXPOSED AND DEVELOPED SILVER HALIDE. THE RESULTING IMAGE CAN BE STABILIZED BY CONTACTING WITH A PHENYL MERCAPTO TETRAZOLE SOLUTION.

DEFENSIVE PUBLICATION 0 UNITED STATES PATENT OFFICE Published at the request 0! the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.6. 687. The

' abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification. including claims and sheets of drawings contained in the application as originally filed. The dies 0! these applications are available to the public-tor inspection and reproduction may be purchased for 80 cents a sheet.

Derensive Publication applications have not been examined as to the merits or alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JULY 18, 1972 00,010 BLUE COLLOIDAL SILVER IMAGING SYSTEM David Clayton Shaman, Kodak Park, Rochester, N.Y. 14650 Filed Sept. 10, 1971, Ser. No. 179,388 Int. Cl. Gii3c 1/16, 5/24, 5/26 US. Cl. 96-50 1 Sheet Drawing. 12 Pages Specification warm " 1 2' 00 4'9 I" (I no it A h! Blue colloidal silver having an average diameter range from about 50 A. to about 300 A. is prepared by physical development of silver nuclei having an average diametcr of about 10 A. to about 200 A. coated on a support. An image may be obtained in the blue silver by contacting it with halide ions which causes the blue silvcr to recrystalline to a yellow form. Contacting a slightly moistened finger against blue silver with light pressure results in a fingerprint of excellent quality in the form of yellow silver. Halide ions may be transferred from an exposed and developed silver halide layer with recrystallization of the blue silver occurring in the area that corresponds to the exposed and developed silver halide. The resulting image can be stabilized by contacting with a phenyl mercapto tetrazolc solution.

July 18, 1972 p. c. SHUMAN BLUE COLLOIDAL SILVER IMAGING SYSTEM Filed Sept. 10. 1971 DAVID C. SHUMAIV INVENT OR.

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